A boat takes 2 hours to travel 8km down and 8 km up the river when the water is still. how much time will the boat take to make the same trip when the river starts flowing at 4km/hr??
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speed of boat = 8km/h
so when it goes 8 km up and down= 8/4 + 8/12= 8/3
2 hrs 40 min
so when it goes 8 km up and down= 8/4 + 8/12= 8/3
2 hrs 40 min
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3
Answer:
2 hours 40 minutes
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